CDMA-based acoustic local positioning system for portable devices with multipath cancellation

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• 作者：Fernando J. Á ; lvarez^a ; ^{fafranco@unex.es}Author Vitae ; Teodoro Aguilera^a ; ^{teoaguibe@unex.es}Author Vitae ; Roberto Ló ; pez-Valcarce^b ; ^{valcarce@gts.uvigo.es}Author Vitae
• 关键词：Acoustic local positioning ; Multipath cancellation ; CDMA-based coding ; Portable devices
• 刊名：Digital Signal Processing
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：62
• 期：Complete
• 页码：38-51
• 全文大小：2762 K
• 卷排序：62

文摘

This paper presents an acoustic local positioning system (ALPS) suitable for indoor positioning of portable devices such as smartphones or tablets, based on the transmission of high frequency CDMA-coded signals from a fixed network of beacons. The main novelty of the proposed ALPS is its capability to mitigate the effects of multipath propagation by performing an accurate estimation of the Line-of-Sight Time-of-Flights (LOS-TOF) through the Matching Pursuit algorithm. Signal detection, multipath cancellation and positioning estimation all take place within the portable device, which provides a graphical representation of the updated position in less than a second. The performance of the Matching Pursuit algorithm is analyzed in a real scenario and the results show that the proposed method is capable to retrieve the multipath-free System Availability under strong multipath conditions with SNR levels as low as 0 dB.